Hello,
Thank you for contacting the support and sorry for any inconvenience that might have been caused due to that.
I’m assuming that you’re referring to the variables shown in the placeholder of the properties in the schema like in this screenshot

If so, you won’t need to put something there as Rank Math automatically fetches the data you have on your content to make your posts/pages schema ready.
However, it is still up to you to customize those data in the schema. Here’s a link for more information about their values:
https://rankmath.com/kb/article-schema/#num-2-5-fill-the-details-in-the-schema-builder
Hope that helps.
Thank you.
Dear Reinelle,
thank you for your answer, now i understand.
Best regards
Jörg
Hello,
We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.